~♂Nick`s♀EdenYard~

微机课程设计（三角波形发生器）

关键词： 微机    课程设计    梯形波    波形发生器    Nicholas                                          

梯形，即是三角+方波。简单。

特点在于，没什么特点

      STACK1  SEGMENT   STACK
              DB        128 DUP(?)
      STACK1  ENDS
        DATA  SEGMENT
    SHIZHONG  DB        127
   SHIZHONG1  DB        63
         GBZ  DB        0F0H
         DBZ  DB        1H
     BIAOZHI  DB        0
   BIANLIANG  DB        0
  BIANLIANG1  DB        0
        DATA  ENDS

        CODE  SEGMENT
              ASSUME    CS:CODE,DS:DATA
      START:
              ;CLI
     
              MOV       DX,DATA
              MOV       DS,DX
                       
              MOV       DX,0
              MOV       ES,DX

   ;++
              MOV       SI,003CH
              MOV       AX,OFFSET IRQ7
              MOV       ES:[SI],AX

              MOV       SI,003EH
              MOV       AX,SEG IRQ7
              MOV       ES:[SI],AX
;              中断服务子程序装入结束
       
          ;8259初始化   ++
              IN        AL,21H
              AND       AL,01111111B
              OUT       21H,AL      ;开0号中断
;8259初始化完毕

;8253初始化 ++
              MOV       AL,10110101B            ;2号通道先低后高方式2 BCD进制计数
              OUT       43H,AL
              MOV       AL,90H      ; 低字节
              OUT       42H,AL
              MOV       AL,11H      ; 高字节
              OUT       42H,AL
             ;out 1 出1ms
            
; 8253初始化结束              
              MOV       BX,0
  ;=================================== 主程序
              JJ:
              STI
              JMP       JJ

  ;[=================================== 主程序 结束
 
       IRQ7:  PUSH      AX
              PUSH      BX
              PUSH      CX

              MOV       AL,0
              CMP       BIAOZHI,AL  ;0代表低 1代表中间 2代表下落
              JE        DIDIANPING
              MOV       AL,1
              CMP       BIAOZHI,AL
              JE        ZHONGJIAN
              MOV       AL,2
              CMP       BIAOZHI,AL
              JE        XIALUO

 DIDIANPING:
              MOV       AL,BIANLIANG
              INC       AL

              MOV       BIANLIANG, AL
             
              MOV       BL,SHIZHONG1
              CMP       BIANLIANG,BL
              JNG       NICKD

              MOV       AL,1
              MOV       BL,0
              MOV       BIANLIANG,BL
              MOV       BIAOZHI,AL  ;改变标志为0
              JMP       EOI

      NICKD:
              MOV       AL,BIANLIANG1
              INC       AL
              INC       AL
             ; INC       AL
              INC       AL
              MOV       BIANLIANG1,AL

              OUT       00H,AL
              JMP       EOI
     ;===========================================
  ZHONGJIAN:  MOV       AL,BIANLIANG
              INC       AL
              MOV       BIANLIANG, AL
             
              MOV       BL,SHIZHONG1
              CMP       BIANLIANG,BL

              JNG       NICKZ
              MOV       AL,2
              MOV       BL,0
              MOV       BIANLIANG,BL
              MOV       BIAOZHI,AL  ;改变标志为0
              JMP       EOI

      NICKZ:
              MOV       AL,BIANLIANG1
              OUT       00H,AL
              JMP       EOI

     ;===========================================
     XIALUO:  MOV       AL,BIANLIANG
              INC       AL
              MOV       BIANLIANG, AL
             
              MOV       BL,SHIZHONG1
              CMP       BIANLIANG,BL

              JNG       NICKG
              MOV       AL,0
              MOV       BIANLIANG,AL
              MOV       BIAOZHI,AL  ;改变标志为0
              JMP       EOI

      NICKG:
              MOV       AL,BIANLIANG1
              DEC       AL
             ; DEC       AL
              DEC       AL
              DEC       AL
              MOV       BIANLIANG1,AL

              OUT       00H,AL
              JMP       EOI

        EOI:  MOV       AL,20H
              OUT       20H,AL

              POP       CX
              POP       BX
              POP       AX
              IRET
             
        CODE  ENDS
              END       START

【作者: St.Nicholas.Von.Lee】【访问统计:】【2007年01月8日 星期一 10:19】【注册】【打印】